External Nodejs Task

Hi All,
I’m trying to run an external task in NodeJs, but getting when start the a process.

Stack trace is:
org.camunda.bpm.engine.ProcessEngineException: ENGINE-09008 Exception while instantiating class ‘’: ENGINE-09017 Cannot load class ‘’:
at org.camunda.bpm.engine.impl.util.EngineUtilLogger.exceptionWhileInstantiatingClass(EngineUtilLogger.java:81)
at org.camunda.bpm.engine.impl.util.ClassDelegateUtil.instantiateDelegate(ClassDelegateUtil.java:53)
at org.camunda.bpm.engine.impl.bpmn.listener.ClassDelegateExecutionListener.getExecutionListenerInstance(ClassDelegateExecutionListener.java:59)

BPMN Modeler is:

NodeJS is:

package → “camunda-external-task-client-js”: “^1.1.1”

Running ‘camunda-bpm-tomcat-7.10.0’ on Win10

Was following Niall’s youtube CamundaCon 2018: Camunda talks Nicely with Others (Camunda) - YouTube @ 5mins in.

Any ideas?


Can you upload your model?

Hi Niall,
BPMN attached.extTaskExecution.bpmn (2.7 KB)


You created a listener on your task that is missing execution semantics.
If you remove the listener it should work.

ahaha - newbie error as result of poking the around.

Enjoying the Camunda journey - keep the video’s coming.

Thanks for the quick response.

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